ESAS 350 objectives 2

Hazel Lynn Ramos · 95問 · 2年前

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What is defined as a local corrosion damaged characterized by surface cavities?

pitting

What refers to the removal of zinc from brasses?

dezincification

What is the scaling off of a surface in flakes or layers as the result of corrosion?

expoliation

What corrosion occurs under organic coatings on metals as fine, wavy hairlines?

filiform corrosion

What refers to the deterioration of material by oscillatory relative motion of small amplitude (20 to 100 µm) between two solid surfaces in a corrosive environment?

Fretting corrosion

Indicate the false statement about corrosion.

The corroded member in a corrosion cell is the cathode.

Steel is an alloy of iron and carbon with limits on the amount of carbon to less than ______ percent.

Indicate false statement about stainless steel?

Stainless steels have tensile moduli greater than those of carbon and alloy steels.

What are the four major alloying elements of austenitic stainless steels?

Iron, chromium, carbon and nickel

The electrical resistance of stainless steels can be as much as _____ time that of carbon steel.

What refers to a shape achieved by allowing a liquid to solidify in a mold?

casting

Which of the following is NOT a hardware requirement for die casting?

Metal mold (matching halves)

What cast iron has modular or spheroidal graphite?

ductile iron

What is a process for making glass-reinforced shapes that can be generate by polling resin-impregnated glass stands through a die?

continuous pultrusion

What term is used to denote a family of thermosetting polymers that are reaction products of alcohols and acids?

alkydes

What is the AISI-SAE steel designation for nickel 3.50 alloy?

23XX

What is the AISI-SAE designation for resulfurized and rephosphorized carbon steel?

12XX

What does AISI stands for?

American Iron and Steel Institute

What does SAE stands for?

Society of Automotive Engineers

What does ASTM stands for?

American Society for Testing and Materials

What is the approximate chromium range of a ferritic stainless steel?

16 % to 20 %

The Group H steels can be used in what temperature range?

600°C to 1100°C

The following are primary alloying ingredients of Group H steel except:

cobalt

The chrome-molybdenum steels contain how many percent of molybdenum?

0.20

The chrome-vanadium steels contain how many percent of vanadium?

0.15 to 0.30

Manganese steel usually contains how many percent of manganese?

11 to 14

The wear-resistance of this material is attributed to its ability to _______, that is, the hardness is increased greatly when the steel is cold worked.

strain harden

The special chrome steels of the stainless variety contain how many percent of chromium?

11 to 17

What refers to the application of any process whereby the surface of steel is altered so that it will become hard?

casehardening

What refers to the ability of steel to be hardened through to its center in large section?

hardening

What is the equilibrium temperature of transformation of austenite to pearlite?

1333°F

The alpha iron will become paramagnetic at temperature above ____________

770°C

What structure is formed when transformation occurs at temperatures down to the knee of the curve?

pearlite

What allotropic form of iron refers to iron that has a temperature range of room temperature to 1670o F?

alpha iron

What steel surface hardening process requires heating at 1000o F for up to 100 hours in an ammonia atmosphere, followed by slow cooling?

nitriding

What is the chief ore of tin?

cassiterite

What is the chief ore of zinc?

sphalerite

What is the mixture of gibbsite and diaspore, of which aluminum is derived?

bauxite

The term “brass” is very commonly used to designate any alloy primarily of:

copper and zinc

The term “bronze” is used to designate any alloy containing:

copper and tin

In a system of designating wrought aluminum alloys, a four digit number is used. What does the first digit indicates?

the alloy group

In a system of designating wrought aluminum alloys, what does the second digit represents?

The modifications of the alloy group or impurity limits

In the system of designating wrought aluminum alloys, the letter F that follows the number indicates what condition of the alloy?

as fabricated

The following alloys are the chief alloys that are die-cast except:

manganese alloys

What is the minimum tensile strength of Gray Cast Iron class 50?

50000 lbf/in2

What is the carbon content of wrought iron?

less than 0.1%

Alnico is an alloy containing how many percent nickel?

14%

The most common beta brass with a composition of 60 % copper and 40 % zinc is called ______.

muntz metal

Red brass contains about how many percent of zinc?

15%

Yellow brass contains approximately how many percent of zinc?

50%

Indicate the false statement.

Tin is relatively soluble in copper.

What is the most abundant metal in nature?

aluminum

Indicate the false statement about aluminum.

It has poor thermal and electrical conductivity.

What is the effect to aluminum with iron as the alloying element?

Reduce hot-cracking tendencies in casting.

What is the effect to aluminum with copper as alloying element?

increase strength up to about 12%

What is the chief ore of titanium?

ilmanite

Which of the following are two well-known nickel alloys with magnetic properties ideal for permanent magnets?

alnico and conife

The Portland cement is manufacture from the following elements except:

asphalt

What gives the average ratio of stress to strain for materials operating in the nonlinear region in the stress-strain diagram?

secant modulus

What test determines the hardenability of a steel specimen?

Jominy end-quench test

What steel relief process is used with hypocutectoid steels to change martenite into pearlite?

tempering

What is another term for tempering?

drawing or toughening

All are steel surface hardening processes except one. Which one?

annealing

For metric wire gage, the No. 2 wire is ________ in diameter.

0.2 mm

Bus bars of rectangular cross section are generally used for carrying ________.

high electric current

What are used for interconnection on printed-circuit boards?

flat flexible conductors

Yellow brass is a copper alloy with improved mechanical properties but reduced corrosion resistance and electrical conductivity. How many percent of yellow brass is copper?

65%

What type of copper alloy is used as collectors for electric generator?

tin bronze

What is the electrical resistivity of pure copper in μΩ-cm?

1.67

What should be the resistivity in μΩ-cm of a resistor material?

50 to 150

What is the most widely used dielectric material in the electrical and electronics industry?

plastic

What are natural or synthetic rubber like materials which have outstanding elastic characteristics?

elastomers

What are cellular forms of urethanes, polystyrenes, vinyls, polyehtylenes, polypropylenes, phenolics, epoxies and variety of other plastics?

plastic foams

What is the widely used electrical insulator?

paper

What is the dielectric strength of an unimpregnated cellulose paper or kraft paper?

6 to 12 MV/m

What is the most widely known carbide?

silicon carbide

Class I capacitors have dielectric constants are up to _____.

500

What are the typical dielectric constants of class II capacitors?

500 to 10,000

What are the most widely used general-purpose coatings?

alkyds

What is widely used in the electronic industry as a structural member, such as tube envelopes, hermetic seals to metals or ceramics, protective coating on hybrid and integrated circuits, etc.?

glass

What refers to glasses which are devitrified about 100oC below their softening point to form a very fine network of crystalline phase?

glass ceramics

The percentage change in magnetic properties of materials resulting from temperature aging called the ____________.

aging coefficient

The change in electrical resistance due to the application of magnetic field is called ____________.

magnetoresistance

Which material is used for de application such as electromagnetic cores and relays?

iron

Which of the following is known as “electrical steel”?

silicon steel

What is the highest-frequency ferrite?

garnet

Which material is used for Schottky barrier diodes, light-emitting diodes, Gunn diodes and injection lasers?

gallium arsenide

What material is used for electroluminescent diodes which can emit either green or red light?

gallium phospide

Lead compounds such as load sulfide, selenide and telluride may be used for which application?

all of the above

For hardness penetration test, the Rockwell test uses what type of penetrator?

sphere

What is the combination of cutting and scratch test of a material?

file hardness test

What refers to the strain energy per unit volume required to reach the yield point?

elastic toughness

The following are typical properties of ceramics except one. Which one?

high thermal conductivity

What refers to the average number of mers in the molecule, typically several hundred to several thousand?

degree of polymerization

What nickel alloy has high electrical and corrosion resistance and high strength at red heat temperature and contain 15 to 20% chromium?

nichrome

Silicon bronze contains how many percent of silicon?

What element is added to copper to increase its strength and fatigue properties?

beryllium

What element is added to copper to make it extremely hard?

aluminum

What element constitutes the major component of most bronzes?

tin

100

What is the most common alloying ingredient in copper?

zinc

Math

Math

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